6/1/11 Main Memory  A semiconductor device which stores the information necessary for a program to run.  2 types  ROM (Read Only Memory)  Contains information that is necessary for the computer to boot up  The information stays there permanently even when the computer is turned off.  RAM (Random Access Memory)  Contains instruction or data needed for a program to run  Got erased when the computer is turned off.

6/1/11 {180AFD5D-5878-439C-97BD-0B18E4353EF2} Control Unit {A9859373-752 -4209-A1 0-D3FC83AF62 6} ALU {F87F B48-7C61-461C-A609-7B032D505DD7} Registers {4DBC6CAD-2179-4953-8C9A-F5F6C8F1D2DE} CPU Central Processing Unit (CPU)  Does most of the work in executing a program  The CPU inside a PC is usually the Temporarily store instructions or data fetched from memory Execute arithmetic operations Fetch instructions from main memory and put them in

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